Supporting structure for the crushing head of a cone crusher

ABSTRACT

A novel supporting structure for the crushing head of a cone crusher in which an eccentric rotating in a frame and the crushing head gyrating in the inner periphery of the eccentric are movable up and down by hydraulic pressure, characterized in that a cylindrical socket is inserted in a sleeve of the frame which is slidable up and down while the eccentric and the crushing head are supported by a hydraulic mechanism mounted on the upper end of the sleeve, thereby reducing the overall height of the cone crusher.

This is a continuation of co-pending application Ser. No. 115,566, filedon Oct. 29, 1987, now abandoned, which is a continuation of applicationSer. No. 924,106, filed Oct. 28, 1986, now abandoned, which is acontinuation of application Ser. No. 721,722, filed Apr. 10, 1985, nowabandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to improvements of a supporting structurefor a crushing head incorporated in a cone crusher and the like to crushstones or ores.

2. Prior Art

According to the known structure of a cone crusher, a sleeve is eithersolidly provided at the center of a frame or is integrally fitted withthe frame by a method such as shrinkage fitting, bolting or the like,and an eccentric is idly inserted in the sleeve to be rotated whiletransmitted a rotating force from a drive unit, thereby gyrating acrushing head which is eccentrically inserted inside of the eccentric.Thus, the ores or stones carried therein are crushed by the gyration inthe area between a lower liner mounted on the top of the crushing headforming a cone shape and an upper liner mounted on the frame facing thelower liner. The size (grading) of the crushed ores (products) dependsupon the discharge opening referred to as the C.S.S. (closed sidesetting), and therefore when the setting becomes larger as a result ofwear of both liners, it is necessary to compensate for the wear of theliners to maintain the specified grading. Furthermore, when the crusheris stopped because of biting such material as tramp irons which areimpossible to be crushed, it is necessary to temporalily enlarge thesetting for the tramp iron release.

In view of the foregoing necessity, the conventional cone crusher has anadjustment ring with a thread for the wear compensation and springs forthe tramp iron release, but has no set-indication system, and thereforethe wear compensation must be performed by the following procedure,i.e., loosing the adjustment ring, turning it, checking the state of thedischarge opening to be suitable and fixing the adjustment ring.

In order to improve such a conventional method, a cone crusher includinga hydraulic mechanism has been proposed so that the eccentric with whichthe crushing head is internally engaged may be moved up and down, i.e.,reciprocated while a torque is applied, as is disclosed in JapanesePatent Publication (examined) No. 57-58216 (FIG. 4) or in JapaneseUtility Model Publication (unexamined) No. 58-178345 (FIG. 3).

In any of the foregoing known cone crushers, however, a hydraulic fluidchamber is located at the center of the bottom part of the crusher, andhydraulic pressure is introduced into this chamber (or cylinder) fromoutside of the crusher so that the main shaft of the eccentric or thecrushing head may be directly (or through a piston inserted therein)moved up and down (lifted or lowered), thereby the discharge openingbetween the two liners is enlarged and narrowed.

In other words, in the case of the known arts, since the bottom part ofthe head center is supported by the top end of the main shaft or by thetop end of the eccentric 2' (FIG. 4) or the bottom part of the mainshaft is supported by the frame (FIG. 3), in order to adjust thedischarge opening, the hydraulic fluid chamber is located at the lowerbottom of the crusher.

Accordingly, not only the overall height becomes larger by such anarrangement of the hydraulic fluid chamber at the bottom part of thecrusher, but the weight of the crusher is increased. Moreover,incidental works such as installment of means for conveying materials tobe crushed also become bulky. Furthermore, since it is required to makea space for carrying out maintenance of the hydraulic fluid chamberlocated at the bottom portion, a specified consideration isindispensable for the layout thereof. Thus, there exist common problemsto be overcome in the known cone crushers.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide a novelsupporting structure of the crushing head for use in a hydraulic conecrusher in which even during the operation thereof the eccentricincluding the crushing head is freely movable up and down, wherein theoverall height of the crusher is reduced by incorporating the hydraulicfluid chamber into the upper part thereof.

In order to accomplish the foregoing object, a supporting structure ofthe crushing head for a cone crusher in accordance with the presentinvention is characterized in that a cylindrical socket inserted in asleeve of the frame is slidable up and down while the eccentric and thecrushing head is supported by the hydraulic mechanism mounted on theupper end of the sleeve.

More specifically, the supporting structure according to the presentinvention is characterized in that a cylindrical socket shaft 6 movableup and down is mounted in the inner periphery of a sleeve 4 which isvertically provided in a frame 1. An eccentric 2 is rotatably providedin the inner periphery of the socket shaft 6 and is engaged with a driveunit to be slidable up and down. A crushing head 3 is rotatably andeccentrically inserted in the inner periphery of the eccentric, and thesocket shaft 6 is supported by the hydraulic fluid chamber 5 through asliding member movable up and down.

By adopting the foregoing supporting structure of a crushing head,wherein the hydraulic fluid chamber is not incorporated into the lowerbottom part of the crusher but into the upper part thereof, being quitedifferent from the prior art, it is possible to restrain the overallheight of the crusher and to reduce the total weight thereof. It isfurther possible that incidental equipment for feeding the materials tobe crushed such as a conveyor line, bucket elevator, etc. are alsosmall-sized or compact.

Other objects, features and advantages of the present invention willbecome apparent in the course of the following description with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings forming a part of the present application,and in which like parts are designated reference numerals throughout thesame,

FIG. 1 is a front sectional view showing the first embodiment of thepresent invention;

FIG. 2 is a front sectional view showing the second embodiment of thepresent invention; and

FIGS. 3 and 4 are front sectional views respectively showing thedifferent prior arts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the accompanying drawings some of the preferredembodiments are described in detail hereunder.

In FIG. 1 showing a preferred embodiment of the present invention, aframe 1 comprises a lower frame 1A and an upper frame 1B combined witheach other, and the side of the bottom of the lower frame 1A isconnected with a drive unit. In other words, the power from the drivesource located outside the crusher is transmitted to a pulley 17 torotate a pinion 18 provided at the end of the same shaft. Rotation ofthe pinion 18 is converted to the rotation of a gear 19 engaged with thepinion 18. The upper end of the body portion of the gear 19 is formed tobe a lower coupling of large depth to be engaged with an upper coupling11. Since the couplings 11, 12 are engaged with each other withsufficient depth, when the upper coupling 11 is moved up and down by arequired distance a sufficient length of engagement as well as strengthis assured so as to prevent disengagement.

The upper coupling 11 is located at the lower part of the eccentric 2,and the main shaft 10 of the crushing head is rotatably inserted in theinner periphery of the eccentric 2. The eccentric 2 is supported by thestep bearing 8 mounted on the lower and inner periphery of the socketshaft 6 together with the gyrating member assembled on the eccentric 2.

A key 20 is projectingly provided on the side of the socket shaft 6, andthis key 20 is inserted in a key groove 21 provided on the innerperiphery of the sleeve 4 in the axial direction to prevent the socketshaft from rotation but making it movable up and down. A concave isformed on the upper end of the socket shaft 6 onto which a sphericalbearing is adapted as the socket shaft liner 7.

A flange 13 is projectingly provided on the upper and outer periphery ofthe socket shaft 6 with a difference in level, and an outer cylinder 14is held to be movable up and down between the flange 13 and the top ofthe sleeve 4 by the ring-shaped hydraulic fluid chamber 5 and thehydraulic pressure.

Numeral 22 is a head nut to be mounted on the head of the main shaft 10,and numeral 23 is a crushing chamber which is formed by a spacingbetween the lower liner 15 and the upper liner 16. Numeral 24 is a feedhopper of the object to be crushed such as ores, stones or the like.Numerals 25 and 26 are an outer bushing and an inner bushing mountedrespectively on the outer periphery and the inner periphery of theeccentric 2, and numeral 27 is a cylindrical bushing mounted on theouter periphery of the socket shaft 6. Numeral 28 is a hydraulic linepipe, numeral 29 is a lube feeding pipe, and numeral 30 is a return lubepipe.

Since the cone crusher of this embodiment is constructed asabove-described, when the drive unit is started, the eccentric 2connected therewith starts rotating. When the eccentric 2 rotates, thecrushing head 3 inserted eccentrically in the inner periphery of theeccentric 2 starts a gyrating movement. In this connection, although thetorque is not transmitted to the crushing head 3, since the crushinghead 3 is rotatably inserted in the eccentric 2, the crushing head 3 isturned slowly by friction.

The socket shaft 6 is provided on the outer periphery of the eccentricand the sleeve 4 is fixed onto the frame 1 on the further outerperiphery of the socket shaft 6, but the torque of the eccentric 2 isnot transmitted thereto structurally.

With respect to the movement up and down (or moving up and lowering) inaccordance with the foregoing structure, since the hydraulic fluidchamber is mounted on the upper end face of the sleeve 4 fixed to theframe 1, when some hydraulic pressure is applied to the hydraulic fluidchamber 5 from outside or is reduced, the socket shaft 6 is moved up orlowered through the sliding member. Since the socket shaft 6 is slidableup and down while supporting the eccentric 2 and the crushing head 3,when applying the hydraulic pressure from outside, a moving-up force istransmitted sequentially in order to the outer cylinder 14, the socketshaft 6, the eccentric 2 (while rotating) and the crushing head 3 (whilegyrating), and eventually the crushing head 3 comes to enlarge or narrowthe discharge opening between it and the frame 1 while making gyratingmovement.

Referring to FIG. 2 showing the second embodiment of the presentinvention, the crushing head 3 is formed to be solid, hollow andmushroon-shaped without distinction between the main body and the mainshaft thereof.

As the present invention may be embodied in several forms withoutdeparting from the spirit of the essential characteristics thereof, theforegoing embodiments are therefore illustrative and not restrictive,since the scope of the invention is defined by the appended claimsrather than by the preceeding description, and all changes that fallwithin meets and bounds of the claims, or equivalence of such meets andbounds are therefore intended to be embraced by the claims.

What is claimed is:
 1. A cone crusher, comprising:a frame defining asleeve having an upper end; an eccentric situated for rotation withinthe frame; a cylindrical socket shaft situated for reciprocal movementwithin the sleeve, said eccentric extending into and being supported bythe socket shaft; a crushing head partly defining a crushing chamber andhaving a portion extending into the eccentric for gyration of thecrushing head relative thereto; a hydraulic fluid chamber situated atthe upper end of the sleeve below the crushing chamber, said hydraulicfluid chamber providing hydraulic pressure for reciprocating saideccentric and the crushing head; and an outer cylinder which togetherwith the upper end of the sleeve partly defines the hydraulic fluidchamber, said outer cylinder supporting said cylindrical socket shaftand being reciprocally moved by the hydraulic pressure in the hydraulicfluid chamber.
 2. The cone crusher as defined in claim 1, furthercomprising:a drive unit engageable with the eccentric.
 3. The conecrusher as defined in claim 2, wherein the hydraulic fluid chamber isring shaped.
 4. The cone crusher structure as defined in claim 3,wherein the socket shaft includes a flange adjacent to the crushing headand the outer cylinder includes a flange which engages the socket shaftflange, said outer cylinder flange being situated for reciprocalmovement between the socket shaft flange and the upper end of thesleeve.
 5. The cone crusher as defined in claim 2, wherein the eccentricincludes a toothed coupling serving as an upper coupling and the drivemeans includes a toothed coupling serving as a lower coupling engageablewith the upper coupling, the extent of said engagement being such thatthe drive from said drive unit to the eccentric is maintained throughoutthe reciprocal movement of the socket shaft.
 6. The cone crusher asdefined in claim 2, wherein the crushing head comprises a cone-shapedbody and a main shaft inserted in said body.
 7. The cone crusher asdefined in claim 2, wherein the crushing head comprises a mushroomshaped solid with a hollow inner portion.
 8. The cone crusher as definedin claim 1, wherein the crushing head comprises a cone-shaped body and amain shaft inserted in said body.
 9. The cone crusher as defined inclaim 1, wherein the crushing head comprises a mushroom shaped solidwith a hollow inner portion.